Sky have had service called Freesat for about 2 or 3 years. See here
http://www.freesatfromsky.co.uk/
This is where you have a Sky dish and Sky box but pay no monthly subscription and get just "free" channels (about 200)
Now BBC and ITV have also announced a Freesat service where you can use an existing Sky dish (or pay to have a dish put up) plus a BBC/ITV Freesat box.
This also subscription free once everything is fitted.
There are no Sky channels on the BBC / ITV Freesat service,.
This is where all the confusion comes in, two people using the name Freesat.